Good versus Evil

The primary plot throughout "The Sisters Brothers" is that of good versus evil. Primarily, the contract killers, which are Eli and Charlie Sisters, represent the evil in the novel. It turns out the target, Hermann Kermit Warm, is innocent, so he represents the good side in the novel. Since Eli and Charlie are contract killers, they are committing the sin of murder by carrying out the orders of their employer, the commodore.

Specifically, Eli Sisters is having an inner struggle with his good side and his evil side. He realizes that when he gets angry that his evil side comes out. His evil side causes Eli to strike out at others, and in some cases, this is what causes Eli to commit murder. Eli knows that killing people is wrong, which is where his good side comes into play. He strives to get out of the...